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I had a look about and it seems that no sites agree! A couple said that anything less than 1:320 was negative, but they also said that a negative value rules out SLE, which isn't true since 5% of SLE patients have negative ANA's.

I also read that values vary according to sex, weight, ethnicity and a few other things.

Hi ya, SoleSinger! Well, for Canada, at the lab my daughter goes to,
<35 kU/L is negative
35-55 kU/L is equivocal
>55 kU/L is positive.
I know this probably doesn't help, because it is metric. I always get a copy of all lab reports, doctor and hosiptal reports. Try asking your Rheumy or GP for the reports. Purhaps, like ours, you will have the normal ranges on all lab work on the report. I have a large binder seperated into different categories for my daughter's health binder. I have a personal information section, important phone numbers(dr.'s and family members) section, lab results, Physical therapy, Nutrition section, Medication section , information about SLE, arthritis, myositis, and a section to jot down questions and correspondance. I hope that this helps someone.